CN109778231A - A kind of gas roasting method of secondary startup of aluminum cell - Google Patents
A kind of gas roasting method of secondary startup of aluminum cell Download PDFInfo
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- CN109778231A CN109778231A CN201910224719.6A CN201910224719A CN109778231A CN 109778231 A CN109778231 A CN 109778231A CN 201910224719 A CN201910224719 A CN 201910224719A CN 109778231 A CN109778231 A CN 109778231A
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Abstract
The invention discloses a kind of gas roasting methods of secondary startup of aluminum cell, including cleaning electrolytic cell；Anode carbon block, the sealing of electrolytic cell, insulation arrangement are installed；The installation of burner and burner are connected with burning station, control station；The roasting temperature control curve of the restarting of setting electrolytic cell before igniting；Control in igniting and combustion process；Stop gas roasting and pours into the energization after electrolyte, starting technique.The present invention not only saves overhaul cost, reduce the generation of overhaul waste material, reduce energy consumption, effectively extend groove life, and the success rate of electrolytic cell restarting can be largely improved, success rate compares traditional roasting technique, and the success rate of restarting has been increased to 80% by original 50%, preferable economic benefit and social benefit, use easy to spread can be generated.
Description
Technical field
The invention belongs to aluminum electrolysis production technique technical fields, and in particular to a kind of combustion gas roasting of secondary startup of aluminum cell
Firing method.
Background technique
The electrolytic cell of electrolytic aluminium factory needs electrolytic cell when encountering power failure for a long time or because of the insufficient supply such as electric power, goods and materials
Series stops production, when having working condition again, it is necessary to restart to electrolytic cell, referred to as the two of aluminium cell
Secondary starting needs to roast electrolytic cell before restarting, after roasting to certain temperature, then pours into electrolyte to electricity
Solution slot is powered.The purpose of calcination is to make the moisture in cathode lining of electrolytic bath by being gradually warmed up to electrolytic cell
It is dried, the temperature of cathode and anode normally produces temperature close to electrolytic cell, and electrolysis trough side part is pricked between paste and cathode block
Carbon seam paste be able to coking and sintering, due to electrolytic cell it is out of service after, the oxidation of the cathode and side wall carbon block of electrolytic cell is serious,
Cathode crack is more, and the part leakage suitable for reading of side pot shell, cathode surface is uneven, so select suitable method of roasting direct
Can electrolytic cell is related to be transferred to production as early as possible, and the especially influence to large pre-baked cell groove life is most important.Currently,
Aluminium cell general method of roasting in China's is mainly baking coke particles method, its disadvantage exists baking coke particles method during use
In: first is that the corner heating of electrolytic cell is slow, slot surrounding bundle paste is bad with preheating, and heating rate, temperature distribution evenness can not have
Effect control；Second is that the complex procedures such as being flexible coupling of electrolytic cell, the installation of part flow arrangement, dismounting and laying of char particle operated
Journey, it is time-consuming；Third is that breeze needs manually to salvage increase labor intensity of workers more after starting, and entire roasting process electric energy expends
It measures larger；Fourth is that can have a non-uniform situation of burner hearth, bottom temperature during roasting, the cathode and liner of motor groove it
Between be easy to produce crack, be easy to happen after restarting molten aluminum leakage the phenomenon that.Therefore, it develops a kind of can simplify and open slot mistake
Journey, the rate of heat addition are controllable, maturing temperature is uniform, are conducive to extend groove life, reduce maintenance cost, reach restarting item as early as possible
The gas roasting method of the secondary startup of aluminum cell of part is desirability.
Summary of the invention
In order to solve the problems, such as background technique, the purpose of the present invention is to provide it is a kind of can simplify open slot process,
The rate of heat addition is controllable, maturing temperature is uniform, is conducive to extend groove life, reduces maintenance cost, reaches restarting condition as early as possible
Secondary startup of aluminum cell gas roasting method.
The gas roasting method of secondary startup of aluminum cell of the present invention, the following steps are included:
1. first the slot thorax of electrolytic cell is purged it is clean, then by the curved indentations electrolyte between adjacent two cathode in electrolytic cell
Fragment is filled and led up；
2. selecting qualified anode carbon block, then anode carbon block is mounted on the boss of the cathode in electrolytic cell, then use capsule
Anode carbon block and cathode clamping are kept the bottom of all anode carbon blocks in same level, and anode carbon block by fixture
Boss upper surface of the bottom away from anode distance be 25~40cm；
3. first by the pole seam aluminium-lid between adjacent two anode carbon block, then at the groove body edge and anode carbon block of electrolytic cell
Edge be laid with asbestos by carry out insulation processing, bedding calcium silicate board at the middle seam between adjacent two rows of anode carbon blocks later,
Roasting cover board is finally laid between anode carbon block and electrolytic cell；
4. installing burner at roasting cover board as required, and the nozzle of burner is set to extend into the lower section of roasting cover board, and spray
Distance of the mouth apart from cathode be 10~12cm, burner after the installation is completed, then roasting cover board and anode carbon block between gap,
It roasts and sealant is installed at the gap between cover board and electrolytic cell and the gap between adjacent two anode carbon block, finally in anode
The surface of carbon block and the surface of roasting cover board cover electrolyte powder, and burner is passed through hose and cable and burning station, control
It stands and is connected, the cladding thickness of electrolyte powder is 150~200mm, and the partial size of electrolyte powder is 0~2mm；
5. before igniting, first removing roasting temperature control curve when electrolytic cell once roasts, and reset the restarting of electrolytic cell
Roasting temperature control curve, the roasting temperature control curve of restarting specifically: roasting 0~16h, temperature be 0~250 DEG C；Roasting 16
~35h, temperature are 250~500 DEG C；35~53h is roasted, temperature is 500~600 DEG C；Roast 53~66h, temperature be 600~
750℃；66~79h is roasted, temperature is 750~850 DEG C；79~83h is roasted, temperature is 850~900 DEG C；83~88h is roasted,
Temperature is 900~965 DEG C；88~92h is roasted, temperature is 965 DEG C；
6. carrying out 2~5min of emptying using control station control burner, carried out a little using nozzle of the igniter to burner later
Fire after the completion of igniting, is timely monitored by control station, measures maturing temperature in electrolytic cell, and controlled into burner
Gas flow be 35~45m3/ h, air mass flow are 350~450m3/ h makes the maturing temperature of electrolytic cell reach step and 5. sets
Temperature requirement；
7. first carrying out when the maturing temperature in electrolytic cell reaches 965 DEG C and stopping gas roasting and pour into electrolyte and be powered to start
Preparation first manually control anode carbon block decline after electrolytic cell keeps 965 DEG C of temperature calcination 4h, make anode carbon block bottom
The distance of boss upper surface away from anode be 3~4cm, then using controller control burner stop roasting, and timely to
Electrolyte is injected in electrolytic cell, then rapidly removes the burner on electrolytic cell, then the portion for burner being removed on electrolytic cell
Position is covered with asbestos board, and when the electrolyte poured into electrolytic cell exceeds 5~8cm of anode carbon block, can be powered starting electrolysis
Slot.
Further, aluminium skin with a thickness of 1~2mm.
Further, the roasting cover board is heat-resisting steel sheet and plate or resistance to hot iron plate.
Further, step 4. in, the sealant be asbestos wool or asbestos board.
Further, step 6. in, when the maturing temperature of electrolytic cell reaches 300 DEG C~600 DEG C, need to measure roasting
Oxygen content in the flue gas of generation, oxygen content need to control between 0.5~3%.
Further, step 6. in, burning stops after baking, and remove burner and will be torn open with asbestos board on electrolytic cell
Except the time that the position of burner covers need to control within 10min.
The present invention has the advantages that first is that the rate of heating can be accurately controlled by the way of gas roasting, it can
Slowly uniformly increase the temperature of cathode surface, thus guarantee electrolytic cell burner hearth and furnace bottom temperature it is uniform, avoid coke
Grain roasting uneven heating is even, and the excessively high cathode of local temperature sticks up shell, and maturing temperature relatively low disadvantage in corner utmostly reduces electricity
The early period for solving slot is damaged, is conducive to extend groove life；Two are a simplified and open slot process, avoid baking coke particles install, be flexible coupling,
The complicated procedures of forming such as separator, alleviate labor intensity of workers；Third is that solving the heated rear middle part protrusion of large-scale pre- training slot cathode, pole
The problems such as away from unevenness, Current distribution in anode is uneven, and anode impacts overtension after falling off and being powered；Fourth is that calcination liter
The process of temperature from inside to outside, is filled up cathode crack to liquid electrolyte and is created condition, and the liquid electrolyte poured into is allowed to penetrate into yin
The current channel of pole cracking initiation, the phenomenon that preventing leakage of filtrate.To sum up, using technical solution of the present invention, saving is accomplished greatly
This, reduces the generation of overhaul waste material, reduces energy consumption, effectively extension groove life, does for the development of company's green low-carbon water power aluminium
Positive contribution is gone out, and can largely improve the success rate of electrolytic cell restarting, success rate compares traditional roasting
The success rate of firing technique, restarting has been increased to 80% by original 50%, can generate preferable economic benefit and society's effect
Benefit, use easy to spread.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that it is made it is any transform or replace, all belong to the scope of protection of the present invention.
The gas roasting method of the secondary startup of aluminum cell, the following steps are included:
1. first the slot thorax of electrolytic cell is purged it is clean, then by the curved indentations electrolyte between adjacent two cathode in electrolytic cell
Fragment is filled and led up, and carrying out filling with electrolyte fragment is to avoid the molten aluminum after melting from entering in cathode crack to reduce thermal shock；
2. selecting qualified anode carbon block, then anode carbon block is mounted on the boss of the cathode in electrolytic cell, then use capsule
Anode carbon block and cathode clamping are caused anode to glide by fixture when preventing anode from acting, while keeping the bottom of all anode carbon blocks
The palm is in same level, and the distance of boss upper surface of the bottom of anode carbon block away from anode is 25~40cm, convenient for subsequent
The installation of burner；
3. first by the pole seam aluminium-lid between adjacent two anode carbon block, aluminium skin with a thickness of 1~2mm, then in electrolytic cell
Groove body edge and the edge of anode carbon block be laid with asbestos by carry out insulation processing, later between adjacent two rows of anode carbon blocks
Bedding calcium silicate board at middle seam, is finally laid with roasting cover board between anode carbon block and electrolytic cell, and the roasting cover board is heat-resisting
Steel plate or resistance to hot iron plate provide the roasting space of closed insulation, heat preservation to roast；
4. burner is installed at roasting cover board as required, the lower section for carrying out and the nozzle of burner being made to extend into roasting cover board,
And the distance of nozzle distance cathode is 10~12cm, the installation of burner is arranged along the length direction of electrolytic cell, is symmetrically set
The spacing set on the roasting cover board of electrolytic cell two sides between adjacent two burner is identical as the spacing between adjacent two cathode,
Burner after the installation is completed, then is roasting between the gap between cover board and anode carbon block, roasting cover board and electrolytic cell
At gap between gap and adjacent two anode carbon block install sealant, the sealant be asbestos wool or asbestos board, into
One step does encapsulation process, and the temperature that can keep the temperature roasting is uniform, reaches preferable roasting effect, finally in the table of anode carbon block
Face and the surface of roasting cover board cover electrolyte powder, and burner is connected by hose and cable with burning station, control station, existing
Field carries out route installation, and gas source signal wire, control line of control station etc. use shielded cable, and fix peace with wire casing specification
Dress；The cladding thickness of electrolyte powder is 150~200mm, and the partial size of electrolyte powder is 0~2mm, reduces dissipating for anode surface to the greatest extent
Heat plays the role of keeping the temperature and prevents anodic oxidation, and, Bao Dusaiguanlukou should be avoided when putting electrolyte powder, prevent from electricity
Solve matter powder from preformed hole flow into electrolytic cell in, when leading to open slot anode drop less than；
5. before igniting, first removing roasting temperature control curve when electrolytic cell once roasts, and reset the restarting of electrolytic cell
Roasting temperature control curve, the roasting temperature control curve of restarting specifically: 0~16h of roasting, temperature are 0~250 DEG C, allow electrolysis
Slot is gradually warmed up from cold conditions；16~35h is roasted, temperature is 250~500 DEG C, the process slowly to heat up；Roast 35~53h, temperature
It is 500~600 DEG C, stablizes the process of heating；53~66h is roasted, temperature is 600~750 DEG C；66~79h is roasted, temperature is
750~850 DEG C；79~83h is roasted, temperature is 850~900 DEG C；83~88h is roasted, temperature is 900~965 DEG C；Roasting 88~
92h, temperature are 965 DEG C, isothermal holding, it is ensured that the stable thermal capacitance of electrolytic cell provides entry condition for starting aluminium cell；
6. carrying out 2~5min of emptying using control station control burner, carried out a little using nozzle of the igniter to burner later
Fire after the completion of igniting, is timely monitored by control station, measures maturing temperature in electrolytic cell, and controlled into burner
Gas flow be 35~45m3/ h, air mass flow are 350~450m3/ h makes the maturing temperature of electrolytic cell reach step and 5. sets
Temperature requirement, when the maturing temperature of electrolytic cell reaches 300 DEG C~600 DEG C, need to measure roasting generate flue gas in
Oxygen content, oxygen content need to control between 0.5~3%, have following points for attention in igniting:
Before igniting, first is that needing to confirm the fire control system of sight in " halted state ", air and gas control valve are all in " manual " state, first
Send three compressed air inlet pipelines, half-open position, by air flow control in 350~500nm3/ h, air conditioning valve opening
25% or so；Second is that adjustment igniting air quantity, Boiler pressure control of lighting a fire is in 400nm3/ h or so；
After the completion of igniting, first is that adjusting whole burners to stable state, air control valve is switched to auto state, and measures cigarette
Oxygen content in gas adjusts air-fuel ratio according to the oxygen content value of detection, and air-fuel ratio drops to 3% or less；Second is that when temperature reaches 350
Degree left and right can be fully open by solenoid valve remote holder valve, gas flow 25NM3Solenoid valve is put into ' automatic ' state by/H, third is that roasting
Detected again when burning temperature to 400 DEG C in burner hearth flue gas content modifies air-fuel ratio as flue gas content > 3% in real time；Four
It is that will see fiery function when 700 degree of maturing temperature or so to close；
7. first carrying out when the maturing temperature in electrolytic cell reaches 965 DEG C and stopping gas roasting and pour into electrolyte and be powered to start
Preparation first manually control anode carbon block decline after electrolytic cell keeps 965 DEG C of temperature calcination 4h, make anode carbon block bottom
The distance of boss upper surface away from anode be 3~4cm, then using controller control burner stop roasting, and timely to
Electrolyte is injected in electrolytic cell, then rapidly removes the burner on electrolytic cell, then the portion for burner being removed on electrolytic cell
Position is covered with asbestos board, when stopping roasting, needs to confirm whether the main gas valve at burning station closes, whether compressed air closes
It closes, burning stops after baking, the time removed burner and covered the position for removing burner on electrolytic cell with asbestos board
It need to control within 10min, when the electrolyte poured into electrolytic cell exceeds 5~8cm of anode carbon block, can be powered and start electricity
Solve slot.
In order to verify the starting situation of method of roasting of the invention, selected 13 electrolytic cells of company carry out restarting, until
On September 5th, 2017,13 secondary slots have been turned on.Wherein in addition to 1054#Pot shell, bottom temperature are higher, and 2046#Furnace bottom
Temperature drift, parameters are normal so far for remaining 11 secondary slot, and secondary slot starts success rate 84.6%, particular exam effect
It is as follows:
The economic benefit that 13 above-mentioned electrolytic cell restartings generate is as follows: by the overhaul cost calculation of 550,000 yuan/slot, for public affairs
Department saves 247.39 ten thousand yuan of overhaul cost, and circular is as follows:
Overhaul cost before activity: 13 × 50% × 550000=357.5 (Wan Yuan)
Overhaul cost after activity: 13 × (1-84.6%) × 550000=110.11 (Wan Yuan)
Save overhaul cost: 357.5-110.11=247.39 (Wan Yuan)
The social benefit of generation: being calculated by the overhaul waste material of 53 tons/slot, and 11 secondary slots successfully start up, and is reduced for company big
583 tons of waste material are repaired, is turned waste into wealth, is that company green low-carbon water power aluminium idea of development tramples passerby, and gas baking is secondary opens
Dynamic successful experience, substantially prolongs groove life, has established solid technical foundation for the sustainable development of company, has filled up aluminium
The technological gap of the secondary slot starting of plate gas roasting.
To sum up, using technical solution of the present invention, overhaul cost is saved, the generation of overhaul waste material is reduced, reduces energy consumption,
Effectively extend groove life, is made that positive contribution for the development of company's green low-carbon water power aluminium, and can largely improve
The success rate of electrolytic cell restarting, success rate compare traditional roasting technique, and the success rate of restarting is by original
50% has been increased to 80%, can generate preferable economic benefit and social benefit, use easy to spread.
Claims (6)
1. a kind of gas roasting method of secondary startup of aluminum cell, it is characterised in that, the following steps are included:
1. first the slot thorax of electrolytic cell is purged it is clean, then by the curved indentations electrolyte between adjacent two cathode in electrolytic cell
Fragment is filled and led up；
2. selecting qualified anode carbon block, then anode carbon block is mounted on the boss of the cathode in electrolytic cell, then use capsule
Anode carbon block and cathode clamping are kept the bottom of all anode carbon blocks in same level, and anode carbon block by fixture
Boss upper surface of the bottom away from anode distance be 25~40cm；
3. first by the pole seam aluminium-lid between adjacent two anode carbon block, then at the groove body edge and anode carbon block of electrolytic cell
Edge be laid with asbestos by carry out insulation processing, bedding calcium silicate board at the middle seam between adjacent two rows of anode carbon blocks later,
Roasting cover board is finally laid between anode carbon block and electrolytic cell；
4. installing burner at roasting cover board as required, and the nozzle of burner is set to extend into the lower section of roasting cover board, and spray
Distance of the mouth apart from cathode be 10~12cm, burner after the installation is completed, then roasting cover board and anode carbon block between gap,
It roasts and sealant is installed at the gap between cover board and electrolytic cell and the gap between adjacent two anode carbon block, finally in anode
The surface of carbon block and the surface of roasting cover board cover electrolyte powder, and burner is passed through hose and cable and burning station, control
It stands and is connected, the cladding thickness of electrolyte powder is 150~200mm, and the partial size of electrolyte powder is 0~2mm；
5. before igniting, first removing roasting temperature control curve when electrolytic cell once roasts, and reset the restarting of electrolytic cell
Roasting temperature control curve, the roasting temperature control curve of restarting specifically: roasting 0~16h, temperature be 0~250 DEG C；Roasting 16
~35h, temperature are 250~500 DEG C；35~53h is roasted, temperature is 500~600 DEG C；Roast 53~66h, temperature be 600~
750℃；66~79h is roasted, temperature is 750~850 DEG C；79~83h is roasted, temperature is 850~900 DEG C；83~88h is roasted,
Temperature is 900~965 DEG C；88~92h is roasted, temperature is 965 DEG C；
6. carrying out 2~5min of emptying using control station control burner, carried out a little using nozzle of the igniter to burner later
Fire after the completion of igniting, is timely monitored by control station, measures maturing temperature in electrolytic cell, and controlled into burner
Gas flow be 35~45m3/ h, air mass flow are 350~450m3/ h makes the maturing temperature of electrolytic cell reach step and 5. sets
Temperature requirement；
7. first carrying out when the maturing temperature in electrolytic cell reaches 965 DEG C and stopping gas roasting and pour into electrolyte and be powered to start
Preparation first manually control anode carbon block decline after electrolytic cell keeps 965 DEG C of temperature calcination 4h, make anode carbon block bottom
The distance of boss upper surface away from anode be 3~4cm, then using controller control burner stop roasting, and timely to
Electrolyte is injected in electrolytic cell, then rapidly removes the burner on electrolytic cell, then the portion for burner being removed on electrolytic cell
Position is covered with asbestos board, and when the electrolyte poured into electrolytic cell exceeds 5~8cm of anode carbon block, can be powered starting electrolysis
Slot.
2. a kind of gas roasting method of secondary startup of aluminum cell according to claim 1, it is characterised in that: in step
In 3., aluminium skin with a thickness of 1~2mm.
3. a kind of gas roasting method of secondary startup of aluminum cell according to claim 1, it is characterised in that: in step
3. in, the roasting cover board is heat-resisting steel sheet and plate or resistance to hot iron plate.
4. a kind of gas roasting method of secondary startup of aluminum cell according to claim 1, it is characterised in that: in step
4. in, the sealant is asbestos wool or asbestos board.
5. a kind of gas roasting method of secondary startup of aluminum cell according to claim 1, it is characterised in that: in step
In 6., when the maturing temperature of electrolytic cell reaches 300 DEG C~600 DEG C, need to measure the oxygen content in the flue gas that roasting generates,
Oxygen content need to control between 0.5~3%.
6. a kind of gas roasting method of secondary startup of aluminum cell according to claim 1, it is characterised in that: in step
In 6., burning stop bake after, remove burner and with asbestos board by electrolytic cell remove burner position cover when
Between need control within 10min.
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Application publication date: 20190521 |
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| RJ01 | Rejection of invention patent application after publication |